HeadSmess
Well-Known Member
- Local time
- 11:24 PM
- Joined
- May 17, 2010
- Messages
- 3,048
takes time to get round to doing things.
pulled apart a honda ct90 generator, currently wound with 0.5mm wire, a bit too high in the current draw still. gunna try for 0.25 next time, and separate the coils so i can wire em parallel and series etc...
theres maths on working out gauss strength and wire to use but it has nasty looking greek symbols so i just waste copper wire
see where i ran out of wire and had to start pulling my tesla coil apart? the shop had no 0.5 in stock!
ahuh. yep. it is. a basic, small power eddy current absorber. an infant, embryonic...
doesnt do a thing when no power is applied to coils.
doesnt do anything when power is applied and theres no movement...
the alloy drum will be mounted on bearings, shafted, and driven via chain from engine.
the coil stator will also be mounted on bearings, and ride on the same axle. this will then have an arm, resting on scales. the arm/rotor is restrained from rotating, and can give a direct reading of torque in ft/lbs etc...
as the coils are energised, the magnetic field created passes a moving conductor (the alloy drum) the conductor produces an emf(power) internally, that creates its own magnetic field, in opposition to the first applied magnetic field.
this loads the drum up. the stronger the magnetic field, the more braking effect. ditto with spinning the drum faster.
power is absorbed and discarded as heat in the alloy drum.
the reason you CANT use an alternator as a brake for very long! unless its a big alternator! which = $$$$$$
the idea being i set the throttle. then vary coil power to load motor to specific rpm by tacho. then read torque from scale. then calculate HP/watts from rpm x torque...
nothing fancy, nothing overboard for now, just a simple comparator for bench testing performance modifications.
someone throw me a few thousand and ill make a fully computer integrated one, but for now...
ITS GOING TO GET HOT!
i think, after half an hours use...ill be getting a new piece of alloy, slightly larger so i can cut fins...one works with what one has... or i spray it with water...
this was a sample piece of 100mm 2011 series i bought for heads. corrodes a lot faster than the other bits in 6061 i got. so im using it for this 6061 for heads
couldnt find anything else that looked suitable for the coil stator
i was contemplating a car brake rotor, slotted... meh. stop thinking, start doing!
if this works as intended, well...then i can think again.
back to the lathe...